; #include "multiboot2.h"
/*  How many bytes from the start of the file we search for the header. */
#define MULTIBOOT_SEARCH                        32768
#define MULTIBOOT_HEADER_ALIGN                  8

/*  The magic field should contain this. */
#define MULTIBOOT2_HEADER_MAGIC                 0xe85250d6

/*  This should be in %eax. */
#define MULTIBOOT2_BOOTLOADER_MAGIC             0x36d76289

/*  Alignment of multiboot modules. */
#define MULTIBOOT_MOD_ALIGN                     0x00001000

/*  Alignment of the multiboot info structure. */
#define MULTIBOOT_INFO_ALIGN                    0x00000008

/*  Flags set in the ’flags’ member of the multiboot header. */

#define MULTIBOOT_TAG_ALIGN                  8
#define MULTIBOOT_TAG_TYPE_END               0
#define MULTIBOOT_TAG_TYPE_CMDLINE           1
#define MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME  2
#define MULTIBOOT_TAG_TYPE_MODULE            3
#define MULTIBOOT_TAG_TYPE_BASIC_MEMINFO     4
#define MULTIBOOT_TAG_TYPE_BOOTDEV           5
#define MULTIBOOT_TAG_TYPE_MMAP              6
#define MULTIBOOT_TAG_TYPE_VBE               7
#define MULTIBOOT_TAG_TYPE_FRAMEBUFFER       8
#define MULTIBOOT_TAG_TYPE_ELF_SECTIONS      9
#define MULTIBOOT_TAG_TYPE_APM               10
#define MULTIBOOT_TAG_TYPE_EFI32             11
#define MULTIBOOT_TAG_TYPE_EFI64             12
#define MULTIBOOT_TAG_TYPE_SMBIOS            13
#define MULTIBOOT_TAG_TYPE_ACPI_OLD          14
#define MULTIBOOT_TAG_TYPE_ACPI_NEW          15
#define MULTIBOOT_TAG_TYPE_NETWORK           16
#define MULTIBOOT_TAG_TYPE_EFI_MMAP          17
#define MULTIBOOT_TAG_TYPE_EFI_BS            18
#define MULTIBOOT_TAG_TYPE_EFI32_IH          19
#define MULTIBOOT_TAG_TYPE_EFI64_IH          20
#define MULTIBOOT_TAG_TYPE_LOAD_BASE_ADDR    21

#define MULTIBOOT_HEADER_TAG_END  0
#define MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST  1
#define MULTIBOOT_HEADER_TAG_ADDRESS  2
#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS  3
#define MULTIBOOT_HEADER_TAG_CONSOLE_FLAGS  4
#define MULTIBOOT_HEADER_TAG_FRAMEBUFFER  5
#define MULTIBOOT_HEADER_TAG_MODULE_ALIGN  6
#define MULTIBOOT_HEADER_TAG_EFI_BS        7
#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI32  8
#define MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64  9
#define MULTIBOOT_HEADER_TAG_RELOCATABLE  10

#define MULTIBOOT_ARCHITECTURE_I386  0
#define MULTIBOOT_ARCHITECTURE_MIPS32  4
#define MULTIBOOT_HEADER_TAG_OPTIONAL 1

#define MULTIBOOT_LOAD_PREFERENCE_NONE 0
#define MULTIBOOT_LOAD_PREFERENCE_LOW 1
#define MULTIBOOT_LOAD_PREFERENCE_HIGH 2

#define MULTIBOOT_CONSOLE_FLAGS_CONSOLE_REQUIRED 1
#define MULTIBOOT_CONSOLE_FLAGS_EGA_TEXT_SUPPORTED 2


        .text
        .globl  _start

_start:
    jmp multiboot_entry

multiboot_header:
        /*  Align 64 bits boundary. */
        .align  8
        /*  magic */
        .long   MULTIBOOT2_HEADER_MAGIC
        /*  ISA: i386 */
        .long   MULTIBOOT_ARCHITECTURE_I386
        /*  Header length. */
        .long   multiboot_header_end - multiboot_header
        /*  checksum */
        .long   -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_I386 + (multiboot_header_end - multiboot_header))

entry_address_tag_start:    
        /* 每个 tag 都要 8 字节对齐 */
        .align  8
        .short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS_EFI64
        .short MULTIBOOT_HEADER_TAG_OPTIONAL
        .long entry_address_tag_end - entry_address_tag_start
        /*  entry_addr */
        .long multiboot_entry
entry_address_tag_end:

        /* 终止 tag 表示 tags 部分结束 */
end_tag_start:
        /* 每个 tag 都要 8 字节对齐 */
        .align  8
        .short MULTIBOOT_HEADER_TAG_END
        .short 0
        .long end_tag_end - end_tag_start
end_tag_end:
multiboot_header_end:

multiboot_entry:
    call kernel_main